And one-third to james c



F. A. GUILFORD.

A LIFTING JACK. APPLlcAloN FILED FEB.28. 1916.

1,323,760. Patented Dec. 2,1919.

570 i uta' IImml unire. ma

'an f FRANK A. GUILronn, or oaxrann, ILLINOIS, AssIGNon' or onn'rninn To WILLIAM I. WILLIaiiIs, or LA GRANGE, ILLINOIS, AND ONE-THIRD rc Jniuns c. :Bowman or CHICAGO, ILLINOIS.

lessees.

LIrvTING-IACK.

fSpecication of Letters Patent.

AApplication led February 28, 1916. Serial No; 80,818.

To all 'whom t may concern:

Be it known that I, FRANK A. GUILroRD, a

member in the body.

channel, one end 'of which is open, as at 18, to expose one side of the standard througha lifting acl: in which the lifting-standard is provided with an auxiliary adjustable member to adapt ythe jack to eiiga-ge'the load to be lifted at widely different elevations.

A furt'hei' object of the invention is to" provide an improved lockingdevice for the liftingV standard lwhich is simple iii construction and inlvvhich Vonly a single dog is necessary to.hold*tlie standard. A vfurther-object of the invention is to provide a lifting jack which can be produced at a low cost. A further object of the'vinvention is to providc a lifting jack which is adapted for'operation by a suitably formed removable and double-ended prying-lever. f

The invention consists in the several novel features hereinafter set fortli and more particularly defined by claims at the conclusion hereof. j p

In the drawings: Figurel is a side elevation of a lifting jack embodying the linvention; Fig. 2 is a section taken on line 2-2 of Fig. l. Fig. Bis a vertical section. Fig. 4L is a vertical section of a portion ofthe jack, showing the parts in position assumed in loweringthe lifting-standard andits load.

Fig. 5 is a perspective of the pivot for the loc-king dog. Fig. 6 is a perspective of the weight for shifting t'he dog.

' The body 8 of the jack has a base `7 and a vertical portion comprising side-walls 9, 1 0 andll, allintegrally formed. rIlhis-body is provided with strengthening ribs 12 Tand openings -lt disposedjto attain maximum carrying capacity with the minimum weight. i

standard fills the space and fits between the sidewalls 9 and 10 and the end wall 11 of the body. Longitudinal ribs 17 formed on the side faces Vof the standard 16 slide in grooves 15v and serve to hold the adjustable rlhe body forms a out its entire length, and permit adjustable connection of an auxiliary lifting member 19 to that side of standard 16. Openings ltb'are formed in the standardto avoid excessive Weight.

Y The lifting meinberl) is adapted to belocked in different' elevations on the standard 16 for lifting the load when the upper end of the standard, in its lowest position, is

'too high to be'placed under the load.' F or this purpose, avertica-l series of recesses Q0 vis formed in the exposed face of the standto project to one side of the body and standard, so it can be projected under the load to be lifted. To renderthe auxiliary'member readily detachable ,and self-locking, it isv vformed to extend into a recess 2O and with a lug 21 and a shoulder' 22,' which form in effect a hook for securing this member to tlieV standard.

Each recess 20 isformed with a notch 23 in its top to receive the lug 21.

Shoulder 22 is adapted to bear against the side portions of the standard between the recesses 20. The weight of the projecting portion of member '19, as well as the 'load applied to it, will securelylock said member to the standard 16, the interfit of lug 2l and notch 23 serving to hold the member against outward movement. To adjust member 19,

it is only necessary to swing its outer end upwardly to withdraw lug` 21 from notch 23 and move the member laterally to unhoolr and releasemember-19. Reverse movement `r will put'the member into inter-.locked relation with any of the recesses 20.

The device for latching or v'locking the standard consists yof a dog 27 "disposed in the upper portion of the body 8 adjacent the inclosed side'of the standard. This dog is formedwith atooth 28 adapted to enter the notches in .one side of the standard.V These not-ches and the standard-portions between them. form a rack 29. Above the tooth 2d the dog is formed with an abutment Y30 rateneeaneea, i919.

adapted to engage Vthe standard and limit the inward movement of the dog.- Dog 27 is V litted on a polygonal central portion 3l of a Y spindle 32 which Yextends laterally through the body. and is pivotally `sustained therein,

being provided'with a reduced cylindrical bearing-portion 33 fitting in acorresponding opening in one sideot' the body and a larger cylindrical bearing portion 3% in .a 'corresponding opening Yin the other side, Vand a Vhead 3:5 at one end.- Outside of the bearing-portion 8B, the spindle is provided with y Y. a reduced terminal which forms apivot for a weighted arm 37. A lug 3S., .formed on Vthe terminal and an arcuate slotv 39 in the'weighted ai'in, into which said lug eX- tends,rprovide av lost-motion connection between the weightl and the .dog which is secured to rock'with the spindle `by the ypolygonal portion 3l, so that theweight may Y be shiftedfeitlier into position at one side or' the axis of the spindle to torce the dog into l lation tothe body 8. l v Y o rlhe invention is designed to utilize the engagement witlithey standard, as shown in i'ull lines in F ig. l, or into position at the other side of said axis, to Vi'iormally,hold the Y dog away roin'the standard, as indicated in Eig. t.. The terminal 36, afterthe weighted arm has been applied thereto, is upset l slightlyor riveted so that it will holdtheV pin and the `wriighted arm in yconnected:re-

i'acl 29`or' the reception Yof a removable prying lever 40.1An angular ,end ill is formed on each end of' the lever and the ter-` minal l2 oil' each angular portion'i's adapted to beinserted betweenra tulcrum-shonlder lron the body and into the superjacent recess of rack 29, Y

'Thepurposein angling! the end-portion of the lever is to render `Vthe lever operative when itscentral portion is at a convenient elevation vabove the ground. During a liftingy operation, the weight for the locking dogwillbe in position shownin Fig. 1,.so the dog will be yieldingly pressed into engagement with the rack V29..,- Bylowering the outerend of this lever, rwhen its othery has thus been inserted, the standard may be' raised `sufficiently to cause thetooth 28 ot' the` dog| 27 to pass into-the next notch and thus lift the standar'dxone step. Ilhis mayV Yloe-repeated as oitenas desired, "the lever' terminal being withdrawn at; the endof the lifting operation and inserted into the nextV lower notch ofther rack. rlhis prying lever alsoY serves to flower the standard step-bystep. Tollo'werthe load, the-weighted arm 37 is shifted into position indicated in Fig. 4, so that'its Jforce, will'be applied to disen- Vgage the dog from the `standard This weight, however, .is insuicien-t initself to Vrock thedog when it sustains the weight 'of the standard'or the load, and consequently, this weight will not releasethe dog from the Vweight of the standard. and theload.

standard until the dog is relieved of the To lower thepstandai'd, one or the terminals of lever Zl() is inserted intoV the notch of the rack 29 adjacent abutment i3 and liii-'posi'- tion indicated in dotted lines in Fig-e and its outer end is then depressed slightly to r^ lieve the tooth 28 or' dog 27, whereupon the Y Vweighted arin will swing the doginto po# sition shown inY full lines in Fig. e. Next,

the outer end olilever 4l()V will beperniitted to be rraised 'slowly by the load which will Cause the operative angular portionot the lever to'strike aresilient strip i4 on the tail e5 of the dog to torce the tooth jintoA the recess or rack 29 above the one last engaged'Y rby the tooth, whereupon' the weight of the a standard and the load will-be applied to 'the dog, which will beheld in position kwith sufficient force `to prevent its shift by the weight. To further lower the standard, the operation of the lever 40 willberepeated,

Y its terminal e2 being insertedinfV the notch,

which-has been last lowered into operative 'relation'V adjacent abutment e8. Resilient strip l-/l'serves to guide theleverterniinal to the proper not-cli inthe-rack and also perinits yielding'A pressure or the lever to be ap- Y plied. thereto to insure .its timely engagement Y with the rack in the'loweringoperation.

.TheA inventiontlius exemplitesfa `lifting p H jack which is simple in -construc'tion Tand can be produced yat a low cost.y A single dog and rack serveto successively lock the standard at dierent elevations,rbothdur'- ing thelifting and lowering operations. The prying lever wholly removable v,froml and connectible to the jack is Vutilized" to-efect' both raising and lowering operation and avoids the necessity of a, pivoted socket.

provision is made crits use'v in Vevent one [end should become broken. The adjustment between the auxiliary engaging member and the standard maybepreadily. elfected. i The devicein its .entirety is. .light in weight.

The'. invention is Ynot to be understood :as

restricted to thefdetail's set Jforth, since these may be modified `withinthe `scope of the ack, the comhinationof Va and at the sides 'of vthe recesses, andan auxiliary supporting member Yhaving a hook extension adapted to passV into and removably interlock with either of the recesses. i p 2. In a lifting-Jack, thecombinationof a .By employing a lever providedfwith anV Y foperative terminal vor portion at both ends,

body, a standard slidably held in the body, means for lifting the standard step-by-step, the standard having a vertical series of recesses in one of its sides, and an auxiliary lifting member having a hook extension comprising an integral upwardly extending lug anda downwardly extending shoulder, each recess having a notch in its top to receive the lng, the body having abutments for the shoulder, said member being removable and self-holding in the recess.

8. In 'a lifting jack, the combination of a body, a standard slidable in the body and provided .with a rack, a dog for looking the standard, means on the dog for shifting it either away from or into the rack ,and an operating lever provided with means for engaging the rack to lift it step-by-step and having means thereon for engaging the dog and forcing it into the rack in lowering the standard.

4. In a lifting dog, the combination of a body, a standard slidable in the body and provided with arack, a dog for locking by-step and having means thereon for foro- L ing the dog into the rack when the lever is operated to lower the standard.

5. In a lifting jack, the combination of a body, a standard having a vertical rack thereon slidably held in the body, a dog for engaging the rack, a prying lever having at each end an inclined portion provided with a terminal for engaging the rack and being completely detachable from the body, said portions being oppositely inclined and of substantially the same shape so that either end of the lever may be used to operate the standard, and a fulornm abutment for the lever on the body.

FRANK A. GULFORD. 

